Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: question: Nomeie as escolas secundárias mais altas para 31851
 ###Tabelas: CREATE TABLE typical_values_of_sfc_for_thrust_engines (typical_values_of_sfc_for_thrust_engines_id AUTO_INCREMENT PRIMARY KEY, Engine type VARCHAR, Scenario VARCHAR, SFC in lb/(lbf·h) INT, SFC in g/(kN·s) INT, Specific impulse (s) INT, Effective exhaust velocity (m/s) INT) CREATE TABLE enrollment (enrollment_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, District-wide INT, High schools INT, Middle schools INT, Elementary schools INT, Other programs & adjustments INT) CREATE TABLE under-23 (under-23_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Venue VARCHAR, Score VARCHAR, Result VARCHAR, Competition VARCHAR) CREATE TABLE sixth_round (sixth_round_id AUTO_INCREMENT PRIMARY KEY, Pick INT, Team VARCHAR, Player VARCHAR, Position VARCHAR, College VARCHAR) CREATE TABLE first_class_bowling_statistics (first_class_bowling_statistics_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Matches INT, Overs VARCHAR, Maidens INT, Runs INT, Wickets INT, Average VARCHAR, Economy VARCHAR, 5w INT, 10w INT, Best Bowling VARCHAR)  
SELECT MAX High schools FROM enrollment WHERE District-wide = 31851